Ok?, I'm gonne try to explain my problem clearly I have 2 Asterisk - Asterisk WAN:On Public IP Address - Asterisk LAN: On a LAN (VPN) X-lite is registered on Asterisk WAN A Budgetone 100 is registered on Asterisk LAN Now I try to make communicate the both phone. When the Budgetone call X-lite, I can see that Asterisk LAN answer the call and try to call the X-Lite. X-Lite not reachable, it launchs the Voicemail application. Right... But I cannot heard anything (the little pretty voice of the woman in Comedian mail) in my Budgtone. Is it a codec problem? SDP negociation? RTP flow? If you encountered the same problem, please reply (with an answer of course :-)) Thanks Ignace